fix: 🐛 Update variable declaration in Window example

[lievenvg]

Issues: 99

PR Checklist

This PR fulfills the following requirements:

• The commit message follows our guidelines: Contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• A changelog entry was added

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

Issue Number: #99

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Resolved issues

[lievenvg]

Blijkbaar was de oorspronkelijke implementatie 'a mixed bag'.
Nu is de implementatie en documentatie correct zodat het ook icm AOT werkt.

[TriangleJuice]

Perfect zo! Kunnen we a.u.b. wel teruggaan naar de afgesproken commit format?

[lievenvg]

My bad, was automatisme van een ander project waarin Commitizen wordt gebruikt.